摘要
运用RNGk ε湍流模型对圆射流在非恒定横向流中的的混合、扩散行为进行了数值模拟研究 .采用计算流体动力学程序FLUENT解控制方程 .选择了与前期实验模拟相同的 2组参数进行数值计算 ,浓度场的数值与实验结果符合得很好 .计算和实验结果显示 ,射流在非恒定横向流中的扩散行为与在恒定流中的情形存在显著差别 ,横向流的不稳定性有效地提高了射流的掺混扩散能力 .
The RNG k\|ε turbulence model is applied to numerically simulate the round jet issuing into an unsteady crossflow,A CFD code,FLUENT,is adopted to solve the flow governing equation.The numerical solutions sucessfully reproduce the relevant similarity relations associated with the steady situation.Two flow situations,which have been investigated experimentally,are computed in the numerical modeling.The computed scalar fields agree well with the corresponding experimental results.It is found that the jet scalar pattern in unsteady crossflow is significant different from that of the same jet in a steady crossflow.The unsteadiness in crossflow enhances the mixing and dilution of the jet.
出处
《水利学报》
EI
CSCD
北大核心
2001年第5期82-88,共7页
Journal of Hydraulic Engineering
关键词
数值模拟
射流
非恒定横向流
掺混扩散
numerical simulation
RNG k\|ε turbulence model
round jet
unsteady crossflow
mixing
